Positive Interaction Effect Research Articles

Unpacking the relationship between entrepreneurial marketing activities and small firm performance

PurposeA question remains unresolved in existing cross-disciplinary research at the marketing/entrepreneurship interface (MEI). This features circumstances when employing a combination of market-oriented and entrepreneurially-oriented activities, known as entrepreneurial marketing (EM) behavior, is likely to lead to positive performance outcomes. Earlier mixed findings provide the need to unpack the nuances of EM practices, in terms of their boundary conditions, regarding circumstances where this behavior does or does not lead to performance-enhancing outcomes. Consequently, the purpose of this study is to examine the complexities of the association between EM activities and small firm performance by assessing quadratic and moderating effects.Design/methodology/approachThis study was underpinned by resource-based theory (RBT). Survey responses were collected from 214 smaller-sized companies in the United Kingdom. The statistical data passed all major checks for reliability, different forms of validity, common method variance and endogeneity bias.FindingsEM activities had a quadratic connection with small firm performance, with this relationship being enhanced (in terms of a positive two-way interaction effect) by market dynamism (a counter-intuitive result regarding environmental conditions). Surprisingly, through a post-hoc test, coopetition (cooperation among competitors to leverage assets and overcome resource constraints) did not play any influential part in helping owner-managers to overcome the potential downsides of EM practices, like the time and cost implications of identifying and exploiting opportunities (i.e., a non-significant three-way interaction effect).Originality/valueUnique insights outline how decision-makers in smaller-sized organizations can harness the potential benefits, and minimise the likely drawbacks, of employing EM activities. However, owner-managers should be cautious when implementing these organization-wide practices, since they are likely to enhance performance, but only up to a fixed point. Indeed, excessive forms of EM activities can weaken small firms’ performance. A counter-intuitive positive moderation effect regarding market dynamism challenges certain earlier findings. Specifically, in some dynamic market conditions, EM activities could be performance-enhancing, since certain environmental-level forces might assist owner-managers to amplify the merits of behavior at the MEI when implemented effectively.

Cheatgrass alters flammability of native perennial grasses in laboratory combustion experiments

Abstract Background The invasive annual grass cheatgrass (Bromus tectorum) increases fuel continuity, alters patterns of fire spread, and changes plant communities in sagebrush shrublands of the Great Basin (USA) and adjacent sagebrush steppe, but no studies have contrasted its flammability to native perennial grasses. Understanding cheatgrass flammability is crucial for predicting fire behavior, informing management decisions, and assessing fire risk in invaded areas. This study aimed to determine the flammability of cheatgrass compared to two native perennial grasses (Columbia needlegrass [Achnatherum nelsonii] and bluebunch wheatgrass [Pseudoroegneria spicata]) across a range of fuel moistures. Results All three grass species had decreased flammability with increasing fuel moisture. Columbia needlegrass averaged 11% lower mass consumption than cheatgrass, and bluebunch wheatgrass had longer flaming duration and higher maximum temperatures than cheatgrass and Columbia needlegrass. The addition of cheatgrass to each perennial grass increased combined mass consumption, flaming duration, and flame heights. For these three attributes, the impact differed by the amount of cheatgrass in the mixture. Maximum and mean temperatures during perennial grass combustion were similar with and without cheatgrass addition. Some attributes of Columbia needlegrass flammability when burned with cheatgrass were higher than expected based on the flammability of each species, suggesting that Columbia needlegrass may be susceptible to pre-heating from combustion of cheatgrass. Conversely, the flammability of bluebunch wheatgrass and cheatgrass together had both positive and negative interactive effects, suggesting the impact on joint flammability from cheatgrass differs by perennial grass species. Conclusions This study provides experimental evidence supporting previous qualitative observations of cheatgrass flammability. Cheatgrass increased perennial grass sustainability and consumption, suggesting that cheatgrass poses a significant fire threat to native grasses regardless of moisture content. The study provides species-specific insights into flammability, which could be used to inform efforts to prevent or mitigate cheatgrass-induced wildfires.

Bank Lending and Policy Interactions—A Comprehensive Assessment for the G20 Countries

ABSTRACTThis study examines the joint impact from supervisory requirements, monetary policies and rescue packages on the supply of bank loans. Evidence is obtained from conceptual considerations and the empirical investigation of G20 banks over the period 1995–2021. To prepare the analysis of interactions, we first address modelling concepts and consistently identify the effects on bank lending that come from each of the regulatory approaches in isolation. Second, we empirically assess the effects that result from the parallel application of policy actions. Short‐term liquidity ratios in combination with further variables mostly associate with positive interaction effects. In contrast, the joint assessment of long‐term liquidity ratios as well as leverage ratios with other policy actions usually provides negative effects. Overall, the results suggest that unconventional monetary policy and rescue actions can stimulate bank lending only after the institutions have restored their own stability. Interactions of policy actions matter, and both regulatory authorities and bank management should consider them.

Interaction Effects Between Low Self-Control and Meaning in Life on Internet Gaming Disorder Symptoms and Functioning in Chinese Adolescents: Cross-Sectional Latent Moderated Structural Equation Modeling Study.

Internet gaming disorder (IGD) is an emerging behavioral addiction with mental health implications among adolescents. Low self-control is an established risk factor of IGD. Few studies have, however, examined the moderating role of meaning in life (MIL) on the relationships between low self-control and IGD symptoms and functioning. This study aimed to examine the effects of low self-control and MIL and their interaction effects on IGD symptoms and family and school functioning in a structural equation model. A sample of 2064 adolescents (967, 46.9% male; mean age 14.6 years) was recruited by multistage cluster random sampling from 5 middle schools in Sichuan, China, in 2022. The participants completed a self-report questionnaire with validated measures on low self-control, presence of MIL, search for MIL, IGD symptoms, school commitment, and family functioning. Construct validity, measurement invariance, and structural invariance of the measures were evaluated by confirmatory factor analysis across sex. Structural equation modeling was conducted to examine the indirect effects of low self-control and MIL on family and school functioning through IGD symptoms. Latent moderated structural equation modeling was performed to examine the interaction effects between low self-control and MIL on IGD symptoms, school commitment, and family functioning. All scales showed satisfactory model fit and scalar measurement invariance by sex. Males showed significantly greater IGD symptoms and lower levels of self-control (Cohen d=0.25-1.20, P<.001) than females. IGD symptoms were significantly and positively associated with impulsivity (β=.20, P=.01), temper (β=.25, P<.001), and search for meaning (β=.11, P=.048) and significantly and negatively associated with presence of meaning (β=-.21, P<.001). Presence of MIL and impulsivity showed a significant and negative interaction effect (β=-.11, SE .05; P=.03) on IGD symptoms. The positive effect of impulsivity on IGD symptoms was stronger among adolescents with low presence of MIL than those with high presence of MIL. Temper showed significant and positive interaction effects with presence of MIL (β=.08, SE .04; P=.03) and search for MIL (β=.08, SE .04; P=.04) on family functioning. The negative effects of temper on family functioning were stronger among adolescents with low levels of MIL than among those with high levels of MIL. This study provides the first findings on the interaction effects between low self-control and presence of MIL and search for MIL on IGD symptoms and functioning among a large sample of adolescents in rural China. The results have implications for targeted interventions to help male adolescents with lower self-control and presence of meaning.

Association Between Maternal Weight Perception Before and During Pregnancy and Postpartum Depression Status in Southern China.

Postpartum depression (PPD) is a common complication after childbirth. Weight misperception can lead to self-esteem issues and mental health problems, especially in women and adolescents. The aim of this study was to investigate the association between weight perception before and during pregnancy and the status of PPD in Southern China. From October 2021 to November 2023, a multi-stage sampling method was used to recruit 2169 eligible mothers aged 18-49 who had delivered live-born singleton infants within 3 to 180 days postpartum. Anthropometric measurements and face-to-face questionnaire surveys were conducted to collect data. The Kappa test was used to assess the agreement between actual and perceived weight. The generalized linear model incorporating multiplicative interaction analysis was applied to explore the associations among variables. The prevalence of PPD status was 18.0%. Among women, 35.2% perceived their pre-pregnancy weight (PPW) as abnormal, while 33.1% perceived their gestational weight gain (GWG) as inappropriate. There was poor agreement between maternal actual and perceived PPW/GWG (Kappa = 0.366, p < 0.001; Kappa = 0.188, p < 0.001), with 27.8% of women misperceiving their PPW and 52.1% misperceiving their GWG. The results of the general linear model indicated that women who perceived their PPW as underweight (β = 0.70, p = 0.016) or overweight/obese (β = 0.86, p < 0.001), as well as those who perceived their GWG as excessive (β = 0.47, p = 0.028) were more likely to exhibit PPD status. The interaction analysis results showed that those who perceived their PPW as underweight and their GWG as insufficient (β = 1.75, p = 0.020), as well as those who perceived their PPW as overweight/obese and their GWG as excessive (β = 0.90, p = 0.001) had a positive interactive effect on the occurrence of PPD status, while underestimating PPW and GWG may be a protective factor against PPD status (β = -1.03, p = 0.037). These findings support that maternal weight perception plays a role in the development of PPD status. Further improvement is needed in personalized health education for weight management, both prior to and throughout the pregnancy period. This can help women reduce weight anxiety, better understand their body image, and potentially lower the risk of developing PPD.

Long-term exposure to wildland fire smoke PM2.5 and mortality in the contiguous United States

Despite the substantial evidence on the health effects of short-term exposure to ambient fine particles (PM2.5), including increasing studies focusing on those from wildland fire smoke, the impacts of long-term wildland fire smoke PM2.5 exposure remain unclear. We investigated the association between long-term exposure to wildland fire smoke PM2.5 and nonaccidental mortality and mortality from a wide range of specific causes in all 3,108 counties in the contiguous United States, 2007 to 2020. Controlling for nonsmoke PM2.5, air temperature, and unmeasured spatial and temporal confounders, we found a nonlinear association between 12-mo moving average concentration of smoke PM2.5 and monthly nonaccidental mortality rate. Relative to a month with the long-term smoke PM2.5 exposure below 0.1 μg/m3, nonaccidental mortality increased by 0.16 to 0.63 and 2.11 deaths per 100,000 people per month when the 12-mo moving average of PM2.5 concentration was of 0.1 to 5 and 5+ μg/m3, respectively. Cardiovascular, ischemic heart disease, digestive, endocrine, diabetes, mental, and chronic kidney disease mortality were all found to be associated with long-term wildland fire smoke PM2.5 exposure. Smoke PM2.5 contributed to approximately 11,415 nonaccidental deaths/y (95% CI: 6,754, 16,075) in the contiguous United States. Higher smoke PM2.5-related increases in mortality rates were found for people aged 65 and above. Positive interaction effects with extreme heat were also observed. Our study identified the detrimental effects of long-term exposure to wildland fire smoke PM2.5 on a wide range of mortality outcomes, underscoring the need for public health actions and communications that span the health risks of both short- and long-term exposure.

Heterogeneous effects of monetary and non-monetary job characteristics on job attractiveness in nursing

We apply a novel methodological approach described by Chernozhukov et al. (2018), to analyze preference heterogeneity regarding non-monetary job characteristics and trade-offs between wage and non-monetary job characteristics. Using this approach, we can describe preference heterogeneity more concise than with subgroup analysis. Analyzing data from a self-conducted factorial survey experiment on nurses, we find significant effect heterogeneity regarding non-monetary job characteristics and their trade-off with wages. We also find positive interaction effects between wage and other job characteristics. We further analyze which factors are associated with effect heterogeneity. Working hours and gender appear to be the main drivers of these effects. We also find differences regarding the sources of a nurse’s motivation to initially choose the nursing occupation. Differentiation of job characteristics (job offers) to fit different preferences can therefore be a more effective and efficient way to attract workers than a “one size fits all” solution.

Marriage as an Argument for Energy Poverty Reduction: The Moderating Role of Financial Inclusion

ABSTRACTThe present research extends the extant literature by investigating the hypothesis on whether marriage can be a substitute for financial inclusion in energy poverty reduction in Ghana. Pooled data and two‐stage least‐squares techniques are used in the estimation process; the validity of the tested hypothesis (i.e., that marriage is a substitute for financial inclusion in energy poverty mitigation) is based on three main criteria: (i) a positive interactive effect relative to the negative unconditional effect of marriage; (ii) a marriage net effect lower in magnitude compared to the unconditional effect of marriage; and (iii) an insignificant interactive effect when both unconditional effects are negative. The investigated hypothesis is not valid in the full sample, urban subsample, and female subsample while it is valid in the rural and male subsamples. Policy implications are discussed.

Identifying the role of high school in educational inequality: A causal mediation approach

Although the effect of socioeconomic background on children’s educational attainment has long been investigated, the extent to which high school mediates this effect has not been assessed from the causal mediation framework. This study investigates the direct effect of family income on educational attainment not mediated by the rank of high school, using data from longitudinal surveys of ninth-grade students in Japan (n = 1,790). Regression with residuals (RWR) analysis reveals that, although high school type mediates the effects of family income on university enrollment and relative educational attainment to some extent (approximately 25% and 33%, respectively), the direct effects of family income are considerable. The result also suggests a positive interaction effect between family income and high school selectivity, implying a boosting advantage pattern rather than a compensatory advantage. I argue that the analytical framework can be applied to many methodological settings in sociological studies.

A - 80 Moderating Effect of Age on the Relationship between Mood and Executive Functioning among South Asians

Abstract Objective This study investigated whether depression and anxiety are associated with executive functioning (EF) performance among South Asians living in the United States (US). Further, we explored whether age moderated this relationship. Method This retrospective chart analysis study included 28 South Asians referred for a neuropsychological evaluation within multiple northeast US-based outpatient clinics. Participants completed the Beck Depression Inventory-2nd edition (BDI-II), Beck Anxiety Inventory (BAI), Stroop Color Word Test- Color-Word Trial (SCWT-CW), and Verbal Fluency (FAS). Participants were dichotomized by age threshold (age 50 cut-off). Logistic regression analysis was used to determine the moderating effect of age on mood and EF. Results The sample comprised 13 younger adults and 15 older adults (50+), with 60.7% male (Meducation = 16.0, SD = 2.3). Regression analysis indicated a significant overall model between age, BDI-II, and SCWT-CW (F(1,25) = 3.01, p &amp;lt; 0.05, ΔR2 = 0.27). Further interaction analysis showed a stronger positive interaction effect between BDI-II and SCWT-CW (β = 5.39, F(1,24) = 4.91, p &amp;lt; 0.05, ΔR2 = 0.15) in the younger adult group. Conclusions Findings suggest that South Asian older adults with lower levels of depression have worse performance on EF than younger adults. This is one of the first studies to identify links between age, mood, and EF. Interpretation is challenging given that the mean scores of depression and SCWT-CW were in the mild range. Future studies are needed to understand how factors, such as English speaking proficiency and acculturation, may moderate the association and impact clinical relevance.

Rhizosphere flavonoids alleviates the inhibition of soybean nodulation caused by shading under maize-soybean strip intercropping

The flavonoids produced by legume roots are signal molecules that induce nod genes for symbiotic rhizobium. Nevertheless, the promoting effects of flavonoids in root exudates in intercropping system on soybean nodulation are still unknown. A two years of field experiments was carried with maize soybean strip intercropping, i.e., the interspecific row spacing of 30 cm (MS30), 45 cm (MS45), 60 cm (MS60), and sole soybean/maize:SS/MM, and root interaction, i.e., root no barrier (NB) and root polythene-plastic barrier (PB), to evaluate relationships between flavonoids in root exudates and nodulation. We found that root-root interaction between soybean and maize enhances the nodules number and fresh weight in intercropped soybean. This enhancement increase gradually with expansion of interspecific distance. Proportion of nodules with diameter greater than 0.4cm was higher in intercropped soybean with NB than with PB. The expressions of nodules-related genes (GmENOD40, GmNIN2b and GmEXPB2) were up-regulated. Furthermore, compared with monocropping, isoflavones secretion of soybean roots reduced, flavonoids and flavonols secretion of maize and soybean roots increased under intercropping. The secretion of differential metabolites of flavonoids in the rhizosphere of maize and soybean declined with root barrier. The expressions of GmCHS8 and GmIFS1 in soybean roots were up-regulated and GmICHG was down-regulated under root interaction. The most of the flavonoids and flavonol compounds were positively correlated with nodule diameter. The nodules number, the nodules fresh weight and the proportion of nodules with a diameter greater than 0.2 cm increased in different genotypes of soybean treated with maize root exudate, which promoted the improvement of nitrogen fixation capacity. Therefore, maize-soybean strip intercropping combined with reasonable spacing to enhance the positive effect of underground root interaction, and improve the nodulation and nitrogen fixation capacity of intercropping soybean.

Adaptive network modeling for joint action and memory recall for elderly by detecting interpersonal synchrony

This paper explores the potential of adaptive network modeling for joint action and memory recall among elderly through detecting interpersonal synchrony. With the aging population increasing, there is a crucial need to focus on the health and social interaction of older adults. Based on research of the significance of social interaction and memory use for the elderly, as well as the role of interpersonal synchrony in joint action, this paper aims to analyse computationally how to enhance positive effects of social interactions among older individuals by applying an adaptive network model. The research examines the concept of interpersonal synchrony and its impact on joint action, memory, and emotional well-being in elderly populations. Through simulation experiments and analysis, the study demonstrates the potential benefits for music in memory recall for older adults with cognitive decline, highlighting the importance of social interaction and emotional resonance. This study offers a valuable contribution to understanding and improving social interactions and memory recall among the elderly.

Corporate social responsibility disclosure in Saudi companies: analysing the impact of board independence in family and non-family companies

This study examines the relationship between family-controlled companies and corporate social responsibility practice disclosure (CSRPD) and examines whether board independence influences this relationship. A self-constructed CSR disclosure index is developed to measure the CSRPD in a sample of 152 publicly listed companies in Saudi Arabia from 2016 to 2021. The findings from the pooled ordinary least squares (POLS) regression reveal that family-controlled companies exhibit lower levels of CSRPD than non-family companies. However, family-controlled companies with a higher number of independent directors on their boards show higher CSRPD, indicating a significant positive interaction effect of board independence. These results remain robust even after applying a variety of econometric techniques, including Newey-West regression, panel corrected standard error (PCSE), logistic regression, and addressing endogeneity problems, along with using different measures for CSRPD and family-controlled companies. These findings suggest that the governance structure of the boards, particularly independent directors, can support the prosocial and positive stimulus of socioemotional wealth (SEW) theory. Therefore, Saudi Arabian capital market regulators need to be aware of the importance of companies’ governance structures.

Prevalence of Metabolic Dysfunction-associated Steatotic Liver Disease and Cardiometabolic Risk Factor in US Adolescents.

Metabolic dysfunction-associated steatotic liver disease (MASLD) is widespread worldwide, and a strong link between MASLD and cardiometabolic risk factors (CMRFs) was emphasized. This study characterized the prevalence of MASLD in adolescent population and overlapping CMRFs conditions in MASLD. This is a cross-sectional study of US adolescents aged 12--19 years in the 2017-2020 cycles of the National Health and Nutrition Examination Survey. The relationship between CMRFs and liver steatosis, evaluated by the median controlled attenuation parameter (CAP), was assessed. The prevalence of MASLD in adolescents was 23.77%. Isolated overweight/obesity (35%) was the top CMRF. Non-Hispanic Black patients had the highest proportion of overweight/obesity plus elevated glucose (24%), while non-Hispanic Asian had the highest burden of dyslipidemia (2%, 14%, and 19%). Except hypertension, overweight/obesity (β=48.7; 95% CI, 43.4-54.0), hypertriglyceridemia (β=15.5; 95% CI, 7.2-28.3), low HDL-C (β=10.0; 95% CI, 3.1-16.9), elevated glucose (β=6.9; 95% CI, 0.6-13.2) were all significantly associated with increased CAP values. Increased CAP was linked to the synergistic interactions between overweight/obesity and dyslipidemia or elevated glucose (overweight/obesity and elevated glucose: RERI=8.21, AP=0.45, SI=1.91; overweight/obesity and hypertriglyceridemia: RERI=19.00, AP=0.69, SI=3.53; overweight/obesity and low HDL-C: RERI=10.83, AP=0.58, SI=2.61). Adolescents with combination of overweight/obesity, dyslipidemia (β=15.1; 95% CI, 0.1-30.2) and combination of overweight/obesity, dyslipidemia and elevated glucose (β=48.0; 95% CI, 23.3-72.6) had a significantly higher CAP values. The prevalence of MASLD was alarmingly high in adolescents, and overweight/obesity was the most important CMRF. Overweight/obesity and dyslipidemia or elevated glucose had positive additive interaction effects on liver steatosis.

How virtual learning community influences student satisfaction

ABSTRACT With the development of the online communication platform, teachers could build a virtual learning community to provide a “second classroom” to interact with students and improve teaching efficiency. Drawing upon social exchange theory and cognitive load theory, this study explored the effect of teacher interaction in the class virtual community on student satisfaction. A multi-wave survey including 525 students was conducted. Results showed that teacher interaction in the virtual community has a positive effect on students’ satisfaction by promoting knowledge sharing, but it also has a negative effect on students’ satisfaction by increasing learning pressure. The positive effect of teacher interaction in the virtual community is strong for students who have a high preference for virtual communities, whereas the negative effect is magnified for students who have a low preference for virtual communities. The findings provide a comprehensive picture of the effect of virtual community in enhancing teaching quality and reveal the underlying mechanisms.

Do high housing prices inhibit entrepreneurial activity?—Evidence from Yangtze River Delta cities, China

AbstractContrary to the existing literature that suggests the inhibitory or facilitating effect of housing prices on entrepreneurial dynamism, this paper explores the nonlinear effect of housing prices on entrepreneurship and countervailing effect of entrepreneurial dynamism on housing prices, in addition to investigating the spatial interaction between the two. This paper constructs a simultaneous equation model (SEM) to empirically test the interaction and spillover effects between housing prices and entrepreneurial dynamism. The results show that: (1) there is a two‐way interaction between housing prices and entrepreneurial dynamism; (2) the estimated coefficients of housing prices and the quadratic square term of housing prices (14.285 and −0.744, respectively) are consistent and significant as expected, indicating an inverted U‐shaped effect of housing prices on entrepreneurial dynamism; and (3) in geospatial terms, there are positive spatial spillovers and negative spatial interaction effects for both house prices and entrepreneurial dynamism in Yangtze River Delta cities.

Social support utilization's effect on post-traumatic stress symptoms: a Danish cross-sectional study of 383 ambulance personnel.

Social support is considered an important factor in prevention of mental illness. However, little is known about the association between ambulance personnel's use of multiple types of social support and post-traumatic stress symptoms (PTSS). This study aims to assess if number of used social support types predicts PTSS for ambulance personnel. Apart from assessing the main effect of social support utilization, we were interested in investigating if social support utilization moderated the effect of frequency of critical events on PTSS. A total of 383 ambulance personnel completed a survey consisting of validated questionnaires. Hierarchical multiple linear regression analyses were performed to assess the association between frequency of traumatic exposure and utilization of social support and PTSS as outcome variable. Higher number of utilized social support types was associated with higher levels of PTSS (β = 0.15, p <.001). When serving as a moderator of the association between frequency of exposure to critical incidents and PTSS, social support utilization had a significant and positive interaction effect (β = 0.26, p = .049). 307 participants had used 2 or 3 types of informal support during the past year, whereas 81 had used 2 or 3 types of formal support. To our knowledge, this is the first study investigating the relationship between utilization of multiple, concurrent social support types and PTSS. This study suggests that to understand the effects of social support among ambulance personnel, it is necessary to assess the utilization of multiple concurrent support types, contributing factors to social support use, and different patterns of social support utilization that constitutes professional life in ambulance work.

Interaction effects of market-based and incentive-driven low-carbon policies on carbon emissions

It is imperative to address global climate change through the formulation and implementation of low-carbon policies. While existing research predominantly analyzes individual policy impacts, this research adopts a Propensity Score Matching (PSM)-weighted Difference-in-Differences (DID) strategy, integrated with an innovative policy-matching methodology, to systematically examine the interaction effects between market-based constraint low-carbon policies and incentive-driven guiding low-carbon policies. The empirical findings underscore substantial positive interaction effects resulting from the combined implementation of these policy types. Even after meticulous control for the individual policies, the amalgamation yields a notable additional emission reduction effect of 0.0571%. This effect further intensifies, reaching 0.132%, when exclusively considering the joint impact of these policies, while robustness is maintained across varied weighting schemes. Moreover, the study elucidates the pivotal role of green innovation as a complete mediator in this synergy, with industrial restructure contributing 18.49% to the overall mediation effect. Despite the ostensibly weak constraints imposed by Low-Carbon City Pilots, the confluence of policies significantly amplifies the emission reduction effects of the Emission Trading Scheme and bolsters the impetus for green innovation. Ultimately, this study not only advances collaborative perspectives on policy effect identification but also offers valuable insights into the combined efficacy of diverse low-carbon policies.

Investigating the effect of fuel properties and environmental parameters on low-octane gasoline-like fuel spray combustion and emissions using machine learning-global sensitivity analysis method

The gasoline compression ignition mode is an advanced combustion mode that achieves high efficiency with low emissions. This study constructs a global sensitivity analysis (GSA) by coupling machine learning (ML) algorithms and conducts a comprehensive investigation into the statistical correlations between research octane number (RON), fuel sensitivity (S), three initial ambient parameters, and the spray combustion characteristics of gasoline-like fuels. Eighty sets of CFD numerical simulation data were used for training the machine learning model. Results show liquid length (LL) is most sensitive to changes in ambient pressure while ambient temperature significantly influences vapor penetration length (VPL). Regarding combustion behaviors, ignition delay (ID) and flame lift-off length (LOL) show the highest sensitivity to ambient temperature. The occurrence of distinct ignition points in the domain also advances from 1.75 ms to 0.42 ms as the ambient temperature rises from 1000K to 1200K. Additionally, the ambient temperature has higher-order interaction effects with ambient pressure on LOL. The production of NOx in the field is also more closely correlated with ambient temperature, with higher temperatures promoting its generation. Furthermore, ambient temperature exhibits a positive interaction effect with both ambient pressure and oxygen concentration on NOx emissions.

The interrelationship between global mindedness and global awareness in explaining variability in global self-efficacy: a cross-country comparison

Recognition and understanding of the interconnectedness of the world and the complex web of global issues can have a positive effect on an individual’s belief in their ability to navigate and make a positive impact on global issues. However, past literature is not clear about how this relationship may be affected by a mindset characterized by openness, empathy, and respect for diverse perspectives and cultures. This study fills this gap in the literature by examining the interactive relationship of global mindedness and global awareness in explaining variation in global self-efficacy. Our results suggest a strong, robust, and positive interactive effect in some but not all countries with our empirical models explaining as much as two-fifths of the total variation in global self-efficacy. Educational implications and suggestions for future research are discussed.